Nautica.lvhttp://www.nauticalive.com
Dzīve uz viļņaFri, 29 Jun 2018 11:57:36 +0000en-UShourly1https://wordpress.org/?v=4.9.3Top Tips to Better Sailinghttp://www.nauticalive.com/top-tips-to-better-sailing/
Sun, 03 Apr 2016 04:10:49 +0000http://www.nauticalive.com/?p=4214read more →]]>One of the best sailing seminars is simply to head out with an old-timer or two who generously share warning after warning, adage after adage, whopper after whopper.

I always carry a notebook for such cases. Here is a sampling of the best tips gleaned over the years.

We probably learn not to repeat each mistake — problem is, there’s still plenty more new ones to make.

To picture prop-walk, imagine a pair of boots hiking in the direction of the propeller (typically clockwise for forward; counterclockwise for reverse).

Walk back-down the companionway ladder into the cabin. That can save a bruised coccyx, or worse — a damaged spine.

Keep nothing hanging around neck that might wind up wrapped around a wench or hooked to an anchor dragging you down.

How to tell if shoes might scuff a boat: walk up and kick a boat (preferably someone else’s). If it leaves a mark, they scuff.

If the winds blow strong and you’re wary over a downwind tack with its likely banging boom, use a “chicken jibe” — which is a 270-degree tack with the bow through the wind, rather than a 90-degree jibe with the stern through the wind.

Tack using geographical reference points rather than compass/wind indicator to avoid instrument lag.

Soften up stiff lines with fresh water and fabric softener.

In rough waters men should sit on the head to pee, to avoid a mess around the floor and walls.

The most critical key to a great sail (or a miserable one) is not the winds, the seas, or the shape of the boat; it’s who’s on board.

How to tell if there are sharks in the water: taste the water. If it’s salty, then there’s sharks.

Says Captain Dan: “Sailing off with your fenders hanging over the side is like walking around with your fly open: It doesn’t really do any harm, but makes you look stupid as hell.”

Here’s the difference between a fairytale and a sailor’s story: Fairytales begin with ‘once upon a time’; a sailor’s story with ‘this is no lie …’

When the sails are overpowered with wind and the boat heels excessively, bleed some of it off. Even though power is decreased, the boat may find better footing and sail faster.

For a 33 foot sailboat, the most dangerous parts of the journey are the first 33 feet and the last 33 feet.
Steven R. Van Hook has cruised California waters since 1976,
starting with a 19-foot Glen-L powerboat in Santa Barbara Harbor,
and currently sails a Hunter 326 out of Channel Islands Harbor.
sailor@wwmr.us
http://howtosail.us

]]>Tides for standart port 3http://www.nauticalive.com/tides-for-standart-port-3/
Mon, 02 Mar 2015 00:52:16 +0000http://www.nauticalive.com/?p=3603read more →]]>Let’s now find out the times and heights of high and low water on September 1st. Note that all times are in UTC (Coordinated Universal Time), formerly known as GMT (Greenwich Mean Time). Watch out – if you are on British Summer Time, you have to add one hour to UTC. On September 1st high water is at 09:56 and 21:30, and low water is at 02:50 and 14:30. Now, if you want to know the actual depth of water in Portsmouth at 14:30, you just have to add the charted depth of Portsmouth and the low water. Low water at 14:30 is 0.4 meters and the charted depth is 6 meters. We add 0.4 meters and 6.0 meters, so the actual depth in the harbor of Portsmouth is 6.4 meters. In case the height of low water is minus, you have to subtract instead of add.
]]>Tides for standart port 2http://www.nauticalive.com/tides-for-standart-port-2/
Mon, 02 Mar 2015 00:51:09 +0000http://www.nauticalive.com/?p=3601read more →]]>Here is an excerpt of a Tide Table. In the first line you see the name of the standard port and where it is located. In the second line information is provided about the time zone in which the times of high and low water are calculated and the coordinates of Portsmouth. In the third line you find the month and the year from which times and tides are calculated. On the left side the day of the month. On the right side you will find times and heights of the tide.
]]>Tides for standart port 1http://www.nauticalive.com/tides-for-standart-port-1/
Mon, 02 Mar 2015 00:47:32 +0000http://www.nauticalive.com/?p=3599read more →]]>Let’s now use the tide table to calculate the tide for a standard port. But first, what is a standard port? In the tide table we distinguish between standard ports and secondary ports. A standard port is a port for which the times and heights of high and low water are predicted for every day of the year. A secondary port is a port that has an assigned standard port. The reason for the use of secondary ports is that it is impossible to list the times of high and low of each port in the world. The tidal curves of the secondary port and the assigned standard port are assumed to be the same.
]]>Tide heights chart datum 2http://www.nauticalive.com/tide-heights-chart-datum-2/
Mon, 02 Mar 2015 00:46:29 +0000http://www.nauticalive.com/?p=3597read more →]]>The difference of height between Mean High Water Spring (MHWS) and Mean Low Water Spring (MLWS) is referred to as spring range.
Also, the difference in height between Mean High Water Neap and Mean Low Water Neap is referred to as neap range.
]]>Tide heights chart datum 1http://www.nauticalive.com/tide-heights-chart-datum-1/
Mon, 02 Mar 2015 00:45:33 +0000http://www.nauticalive.com/?p=3595read more →]]>Let’s have a closer look at “Tidal Heights” and “Chart Datum”.
On nautical charts, soundings and drying heights are measured from Chart Datum.
Chart Datum is the Lowest Astronomical Tide or L A T , meaning the lowest level to which the tide is expected to fall. All depths on a chart are measured below chart datum and all drying heights are measured above it.
Non-drying heights, for example a lighthouse, are always measured above Mean High Water Springs, not Chart Datum, as an added safety margin.
The height of tide is always measured above Chart Datum.
]]>Atlas and infoshttp://www.nauticalive.com/atlas-and-infos/
Mon, 02 Mar 2015 00:44:22 +0000http://www.nauticalive.com/?p=3593read more →]]>In a tidal stream atlas you can find information about a specific area, such as the English Channel.
On separate pages you can find information about the tidal stream for each hour before high water, and each hour after high water.
Each page provides information about the set and the drift of the stream.
The drift is usually shown in knots and tenths of a knot for a mean neap rate or a mean spring rate.
]]>Tidal diamondshttp://www.nauticalive.com/tidal-diamonds/
Mon, 02 Mar 2015 00:43:14 +0000http://www.nauticalive.com/?p=3591read more →]]>Information about the set and drift of the tidal stream can be obtained from Charts or Tidal Stream Atlases.
On charts the tidal streams are marked with a letter within a diamond, and a table provides information about the set and drift for spring and neap tides.
With the time of high water at the standard port, e.g. Portsmouth, you can select the hour you are interested in, either “before High Water or after High Water.
Head across the table to the tidal diamond, and read off the set of the tide and the drift in knots. Note the difference between the spring and the neap range.
]]>Introductionhttp://www.nauticalive.com/introduction-19/
Mon, 02 Mar 2015 00:42:17 +0000http://www.nauticalive.com/?p=3589read more →]]>The tidal stream is the horizontal flow of water which is caused by the rise and fall of the tide.
The direction of the tidal stream is called “set” and its speed is called “drift”.
In a harbor we call the tidal stream the flood stream, when the tide is rising, and the ebb stream, when the tide is falling.
Offshore we use the name in accordance with which direction the tidal stream is flowing towards
e.g. “south going stream” or “the stream is setting 180 degrees”.
A good indication of the set of the stream is given by ships at anchor or moored buoys.
Note that water which is driven mainly by the prevailing winds are called currents.
]]>Tidal curve 2http://www.nauticalive.com/tidal-curve-2/
Sun, 01 Mar 2015 23:40:48 +0000http://www.nauticalive.com/?p=3564read more →]]>If you need the height of the tide for a particular time, for example for 13:00, just enter the required time at the timescale grid.
13:00 is roughly 3 hours after high tide.
Then check whether the tidal range is close to a spring range or neap range.
In our case we have a tidal range of 3.8 meters; 4.2 – 0.4 equals 3.8 meters.
As we can see from the mean ranges, 3.8 meters is close to a spring range.
Next we draw a line from 3 hours after high water to the spring curve.
Here we can interpolate by eye.
From the intersection of the line and the spring curve we draw a horizontal line to the high and low water line. From here we draw a line to join the top scale.
The number at this point is the height above chart datum of the tide at the required time.
To calculate the total depth of water in the Port of Portsmouth, we add the height of tide to the depth shown on the chart.
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